Question

10. Countless experiments and nights of no sleep        his great invention which was famous all over the world.

   A. turned to   B. led to

   C. stuck to   D. referred to

Answer 1

10. B主语和宾语之间的语境逻辑暗示该空表示"导致"，因此应填led to。 turn to意为"朝向;变成;求助于"；stick to意为"坚持"；refer to意为"提到;参考"。均与语境逻辑不吻合。